318000644897 has 4 divisors (see below), whose sum is σ = 342462232980. Its totient is φ = 293539056816.

The previous prime is 318000644873. The next prime is 318000644903. The reversal of 318000644897 is 798446000813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798446000813 = 19 ⋅42023473727.

It can be written as a sum of positive squares in 2 ways, for example, as 17108901601 + 300891743296 = 130801^2 + 548536^2 .

It is a cyclic number.

It is not a de Polignac number, because 318000644897 - 2²² = 317996450593 is a prime.

It is a super-2 number, since 2×318000644897² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318000644807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12230794022 + ... + 12230794047.

It is an arithmetic number, because the mean of its divisors is an integer number (85615558245).

Almost surely, 2^318000644897 is an apocalyptic number.

It is an amenable number.

318000644897 is a deficient number, since it is larger than the sum of its proper divisors (24461588083).

318000644897 is a wasteful number, since it uses less digits than its factorization.

318000644897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24461588082.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 318000644897 in words is "three hundred eighteen billion, six hundred forty-four thousand, eight hundred ninety-seven".